A great miracle happened when this missile fell. 

the rav of the local eruv went out to fix what he assumed would be a destroyed eruv, sensing that the eruv poles and wires in that immediate area would have been damaged by the explosion. When he got there with his tools he discovered the eruv was fully intact having incurred no damage at all.

A miracle!

5 people got injured, but the eruv wire didnt tear and that's what is important.

This was such an amazing miracle that the rabbonim of Bnei Braq went out to see the miracle for their own eyes and expressed that in the merit of shabbos observance of the people of Bnei Braq it protected the city and I guess it protected the eruv that helps them observe shabbos.

This is a tremendously busy area. There are skyscrapers there alongside large malls and businesses, with almost permanent traffic jams. A large missile hit the area, did not hit any of the large buildings , caused some damage to a couple stores and a bus but it didn't knock down any of the skyscrapers it narrowly missed, didnt destroy tens of people in their cars on those busy roads, injured only 5 people in an area that could have seen tens of injured or killed...

But the eruv is the big miracle.

אִם ה' לֹא יִשְׁמָר עִיר - שָׁוְא שָׁקַד שׁוֹמֵר